18861137 has 2 divisors, whose sum is σ = 18861138. Its totient is φ = 18861136.

The previous prime is 18861121. The next prime is 18861181. The reversal of 18861137 is 73116881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18671041 + 190096 = 4321^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 18861137 - 2⁴ = 18861121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18861097 and 18861106.

It is not a weakly prime, because it can be changed into another prime (18861187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9430568 + 9430569.

It is an arithmetic number, because the mean of its divisors is an integer number (9430569).

Almost surely, 2^18861137 is an apocalyptic number.

It is an amenable number.

18861137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18861137 is an equidigital number, since it uses as much as digits as its factorization.

18861137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 18861137 is about 4342.9410541705. The cubic root of 18861137 is about 266.1885005672.

The spelling of 18861137 in words is "eighteen million, eight hundred sixty-one thousand, one hundred thirty-seven".